Moderate-size is a term used to describe something that is neither too small nor too large. However, there are many other words that can be used instead of moderate-size to convey the same meaning. Some synonyms for moderate size include average, medium-sized, intermediate, fair-sized, substantial, and decent. All of these words essentially mean the same thing, but they add variety and nuance to your writing. Using synonyms can help keep your writing interesting and dynamic. The next time you need to describe something that is moderate-sized, consider using one of these alternatives to add some flair to your prose.